Tonneau Cover
A cover of leather or other soft pliable material used for protecting
the interior of a convertible when the soft-top is down.

Turning Circle
Diameter of a circle within which a car can be turned around.

Turning Radius
Diameter of a circle within which a car can be turned around.

Two Plus
Two (2+2)
Body style incorporating two front seats plus two very small seats at
the rear for children, small pets or extra luggage.

Thermal Reactor
A high-volume thermally isolated chamber replacing the exhaust
manifold and providing a place for high-temperature after burning of
exhaust pollutants.

Thrust Bearing
A bearing with flanges on its two sides that prevents a shaft such as
the crankshaft from moving endwise.

Tie Rod
In the steering system, the rods that link the pitman arm and the
idler arm to the steering knuckle arms.Timing
Refers to the crankshaft angles at which the valves and ignition
points open and close.

Timing Chain
A chain for driving the camshaft from the crankshaft.

Timing Belt
A belt for driving the camshaft from the crankshaft.

Timing Gears
A method of driving the camshaft from the crankshaft often used where
long life and hard service are expected as in commercial vehicles and
race cars.

Torsion Bar
A long straight bar fastened to the frame at one end and to a
suspension part at the other.

Twincam
An engine with double overhead camshafts.

Total
Out-Of-Pocket Cost
This is the total of all monthly payments, any lease fees and
deposits, and any capital cost reduction (except tax, license, and
registration) from lease inception to closure.

Torque
The turning or twisting force such as the force imparted on the drive
line by the engine. Usually measured in lb.-ft. It differs from work
or power in that torque does not necessarily produce motion.

Turbo
Charger
An exhaust powered turbine super-charger. Turbochargers always use
centrifugal-flow compressors, which operate efficiently at the high
rotational speeds produced by the exhaust turbine.

Throttle Body
A housing containing a valve to regulate the airflow through the
intake manifold. The throttle-body is usually located between the air
cleaner and the intake plenum.

Transaxle
A drive setup in which the transmission gearbox, clutch, final drive,
and differential are combined into a single unit connected directly to
the driveshaft. It is used mostly in rear-engine cars.Track
Front track is the distance between the center of the left front wheel
and the center of the right front wheel when the vehicle is set to its
normal ride height and wheel alignment specifications. Rear track is
the distance between the center of the left rear wheel and the center
of the right rear wheel. They are not always the same.

Torque Converter
A unit in an automatic transmission, quite similar to the fluid
coupling, that transfers engine torque to the transmission input
shaft. It also cushions the flow of power. Unlike the fluid coupling,
the torque converter can multiply engine torque. This is accomplished
by installing one or more stators between the torus members. In the
torque converter the driving torus is referred to as the "pump" and
the driven torus as the "turbine." The engine drives the impeller,
which in turn impels fluid against the vanes of a turbine connected
through transmission gears to the driveshaft of the automobile. The
stator redirects oil flow from the turbine to boost impeller action
and multiply engine torque.

Trim
Nonfunctional metal or plastic molding, frames, and other decorative
additions to vehicle bodies and interiors.

Toe-In
An adjustment of the front wheels where the distance from the center
of the left wheel to the center of the right wheel is less at the
front of the wheels than at the back of the wheels. A slight amount of
toe-in is usually specified to keep the front wheels running parallel
on the road by offsetting other forces that tend to spread the wheels
apart. The major force is the backward thrust of the road against the
tire tread while the vehicle is moving forward. Other factors include
play in the tie-rod assembly and allowance for angular changes caused
by wheel bounce or variations in road conditions. Toe-in is measured
in fractions of an inch or millimeters.